`torrenttools show infohash --protocol=2` should not show v1 hash

[milahu]

torrenttools v0.6.2 always returns the v1 hash

$ torrenttools show infohash --protocol=1 test.torrent
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

$ torrenttools show infohash --protocol=2 test.torrent
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

$ torrenttools show infohash --protocol=3 test.torrent
Error: Invalid bittorrent protocol: 3

expected: torrenttools show infohash --protocol=2 should print nothing on v1-only torrents